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焊管与无缝管的区别在哪些地方?

来源:http://www.jnxxjm.com

【 发布于:2019-03-08 16:59:30 】


1、由于金粉的化学性质不够稳定,假设与酸、碱、碳和硫化物接触时,就会产生不同程度的化学变化,而使它的金属光泽性大为降低,金墨就会显得发黑。因而金墨应避免用于印刷大面积的国产铜版纸、胶版纸,由于采用酸法造纸工艺消费的纸张呈酸性,印刷后金墨不只变色,还会失去光泽性;同样的道理,分配金墨的辅助材料,也不应运用含酸的辅助料,而应采用中性物质分配;

1. Because the chemical properties of gold powder are not stable enough, it is assumed that when contacted with acids, alkalis, carbon and sulfides, chemical changes will occur to varying degrees, which will greatly reduce the metallic luster of gold powder and make gold ink appear black. Therefore, golden ink should be avoided for printing large areas of domestic copperplate paper and offset paper. Because the paper consumed by acid paper making process is acidic, golden ink will not only discolor after printing, but also lose luster. In the same way, the distribution of auxiliary materials of golden ink should not use acid-containing auxiliary materials, but should adopt neutral material distribution.

2、由于金墨容易与空气、水蒸汽接触而发作化学反响惹起变色,所以要做好对金粉的保管环节,不要让它随意暴露于空气中,没有用尽的金粉应包紧盖严;

2. Because the gold ink is easy to contact with air and water vapor and cause discoloration due to chemical reactions, it is necessary to do a good job in the storage of gold powder, do not let it be exposed to the air at will, and the unused gold powder should be wrapped tightly and tightly.

3、金属的运用应控制随调随印的准绳,即一次分配量宜适用于连续印刷3小时左右,以免量调过多使金粉在油脂中时间太长,与空气接触氧化蜕变而失去金色光泽;

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3. The application of metals should be controlled according to the principle of adjusting with printing, that is, the one-time allotment should be suitable for continuous printing for about 3 hours, so as to avoid excessive adjustments of gold powder in grease for too long and losing its golden luster due to oxidative transformation in contact with air.

4、金墨印刷的机速不宜开过快,由于机器转速快墨辊的摩擦热量相应加大,致使容易使金墨氧化变黑。所以,印金的机速宜控制在每小时3000张左右;

4. The speed of golden ink printing should not be too fast. Because the speed of the machine is too fast, the friction heat of the roller increases correspondingly, which makes the golden ink oxidized and blackened easily. Therefore, the printing speed should be controlled at about 3000 sheets per hour.

5、胶印印金的润版液,应采用含有醇类或树胶类的润版液,以免因酸性润版液与金粉反响会使印品墨色变得深暗而失去光泽;

5. Alcohols or gums should be used in the embossing solution of offset printing gold, so as not to make the ink dark and lose luster because of the reaction between acid embossing solution and gold powder.

6、印金时应调好胶辊,各胶辊的位置要调准确,以免因传墨不良构成印刷过程中堆墨情况呈现,使金粉滞留在胶辊上长时间的摩擦,惹起金墨氧化变色。此外,印金的胶辊运用支数应尽能少用,以减少摩擦热量惹起金色变黑发作的机遇;

6. Cots should be adjusted properly when printing gold, and the positions of COTS should be adjusted accurately so as to avoid the occurrence of ink piling in the process of printing due to poor ink transmission, so that gold powder can stay on the cots for a long time and cause oxidative discoloration of gold ink. In addition, the number of rollers used for gold printing should be used as little as possible to reduce the chance of gold blackening caused by friction heat.

7、当机器墨斗、墨辊用煤油、气油刚刚清洗,滞留于其表面上的有机溶剂还没有完好挥发掉,即马上中止金墨印刷,致使金墨与溶剂发作反响惹起变色;

7. When the machine ink bucket and ink roller have just been cleaned with kerosene and gas oil, the organic solvent remaining on the surface of the machine has not been completely volatilized, that is to say, the printing of gold ink will be stopped immediately, which will cause the reaction between the gold ink and the solvent to cause discoloration.

8、印刷金墨的半废品不要堆叠的太多,假设太多金墨在纸面单调过程中所释放出的热量,不能尽快分发出,也会使金墨氧化变色;

8. Don't stack too many semi-wastes of printing gold ink. Assuming that too much heat released by printing gold ink in the monotonous process of paper surface can't be distributed as soon as possible, it will also make the gold ink oxidized and discolored.

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